非均质气藏局部封存水体性质及水侵动态分析方法研究

ANALYSIS METHOD OF AQUIFER BEHAVIOR AND WATER INVASION PERFORMANCE PARTLY TRAPPED IN HETEROGENEOUS GAS RESERVIOR

对有水气藏的储量核实和开发动态分析 ,水侵动态的研究是必须的基础工作 ,如何利用气藏开发早期的试采数据来研究水体的性质及早期水侵动态 ,对有水气藏的开发中实施早期控水措施具有重要的实际意义。在Coats模型的基础上 ,文章研究了非连续气水界面和气藏非连续测压情况下的AIF模型 ,证明了该条件下水体影响函数的特征值存在不全为零的情况 ,在改进的AIF模型基础上 ,获得水侵动态分析的最优化问题并给出了相应的解法 ,该方法比LP方法具有明显的改进。实例研究表明 ,该方法不仅可以准确获得非均质气藏水体性质和水侵动态 ,而且可正确反应由于断层切割形成的较小的局部封存水体的性质及水侵动态 ,并首次指出了其水体影响函数为抛物线性型。

study of water invasion performance is the ground to verify the reserves of aquifer gas reservoirs and analyze production performance. It is very important for early water control in aquifer gas reservoirs to use the early production testing data for studying the aquifer behavior and water invasion performance. Based on coats model, AIF model is studied under the conditions of non-continuous gas-water boundary and non-continuous pressure testing of gas reservoirs. The study shows that in this case, the characteristic values of Aquifer Influence Function analysis of water invasion performance is obtained, and the relative solution is proposed. This method has more improvement than LP method. Real case study indicates that the method can not only acquire the aquifer behavior and water invasion performance exactly, but also reflect the aquifer behavior and water invasion performance trapped by faults correctly. At the some time, it points out that AIF of small aquifer trapped by faults is a parabola.